Reversible single layer wire grinder



y- 1951 L. ILLMER ETAL 27,551,377

REVERSIBLE SINGLE LAYER WIRE GRINDER Filed Dec. 10, 1948 5 Sheets-Sheet 1 ,45&'

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May 1, 1951 ILLMER ET AL 2,551,377

REVERSIBLE SINGLE LAYER WIRE GRINDER Filed .Dec. 10, 1948 5 Sheets-Sheet 5 \Q o I\ NI 7 L L? 9L 8 m l I I S g I. I N 2 6 INVENTORS? Lou/s /L LMER VERA 4h Prams May 1, 1951 ILLMER ET AL REVERSIBLE SINGLE LAYER WIRE GRINDER 5 Sheets-Sheet 4 Filed Dec. 10, 1948 U Q N JNVENTORS.

May 1, 1951 L. ILLMER ET AL 2,551,377

REVERSIBLE SINGLE LAYER WIRE GRINDER Filed Dec. 10, 1948 5 Sheets-Sheet 5 Fig. 3. 6/ 4 INVENTORo Z 0015 lunar Patented May 1, 1951 REVERSIBLE SINGLE LAYER WIRE. GRINDER Louis Illmer, Cortland, N. Y, and Vernon R. Pallas, Kent, Ohio Application December 10, 1948, Serial No. 64,497

(Cl. 517l) 13 Claims.

The present invention broadly relates to a novel strand grinding machine of the heavy duty surfacing type, and is more particularly concerned with improved controls for rapidly processing high tensile alloy steel or copper wire and the like reelable stock in long lengths having either a circular or polygonal profile. The instant ma chine is especially adapted to reversely drag such treated work piece in successive passes between a pair of power driven transfer reels at a sumciently high linear travel velocity rate which of itself furnishes intensive cutting action when a slowly advanced abrasive agency such as paper backed tape or the like, is applied thereto crosswise of the work piece travel to treat the entire wire perimeter in a single pass.

Our pair of comparably sized parallel reels are preferably given a like relatively wide face measuring several feet and respectively have aligned ends lying in substantial registry to constitute duplex sets of opposed or mated corresponding reel ends. Each terminal region of a long abrasively treated strand of finite length may be conjointly wrapped about the respective reels to complete the formation of a virtual single layer that combinedly extends entirely across said faces into close adjacency with the aforesaid sets of reel ends to leave a medial strand region tangentially suspended between the leading and trailing reels. Said medial region is transferably dragged and abrasively treated by grinder head means as a work piece that simultaneously has a lateral shift imparted thereto.

While the driven leading reel wraps additional coils thereon, the trailing reel may liberate a like number of coils and thus maintain the suspended strand component in a perpendicular rclation to the respective reel axes while said work piece is being reciprocatively shifted across the entire face width of our reels into and out of aligned registry with the opposed sets of corresponding reel ends.

Suitable level winder means train and thereby lay such transferred. reel coils in close wound adjacency to obtain ample strand stowage capacity for each treated batch pass. Our reels may be automatically reversed in unison when the coil build-up on the leading reel has nearly reached one of its ends. The abrasive agency of our grinder head means is maintained in operative con-tact withv its work piece and positively moved by driven carriage means in the direction of the reel axes to compensate for the lateral shift imparted to such reel suspended strand component.

Penetrative work piece grinding is herein effected in successive passes by repeated strand transfers in reversed directions. Said combined single layer reeling facilitates high transfer eloc ity without strand entanglement or snarlingto afford an inherently rapid abrasive action although applied to larger gauged work pieces particularly of alloy steel from to in diametral size. We purposely avoid subjecting treated strand to axial twist in. order to obviate the grinding of superficial flats or ridges.

Our multiple apertured grinder heads are carriage conveyed in order to maintain large sized treated rod stock in tangentially reel-spanning alignment and thereby obviate kinking such rectilinear suspended work piece in the direction of. the leading reel length while being level wound thereon in single layer formation. Such practice also permits of safely transferring a reeled batch at augmented velocity to achieve the utmost rate of cutting action. It is herein preferred to resort to a relatively long reel in comparison to its diameter, the wrapped coils being stressed somewhat beyond their elastic limit to settingly crimp the same about a relatively small low cost reel diameter.

The object of our invention is to devise a reversible wire grinder unit of the indicated character designed to perfect its reeling equipment and to compactly install therebetween standardized grinder heads, particularly of a type made bodily shiftable in parallelism with one reel axis for level winding wire in a single long-sweep layer.

Reference is had to the accompanying five sheets of drawings representing certain exemplifications and in which:

Fig. 1A shows a broken top or plan view of the fore end portion of a grinder equipped with control refinements arranged to automatically reverse our mated reels after having transferred a prescribed number of wire turns, and Fig. 1B shows the aft end view portion of the same grinder unit.

Figs. 2A and 213, respectively depict corresponding elevational side views of Figs. 1A and l and l 1 serving as a foundation sill for mounting an elongated superstructure thereon.

Intermediate the respective ends of such sills, are erected a pair of laterally interspaced bed plate components l2 and [3 each provided with a stationary upturned flat guideway such as MA or MB extending lengthwise of one reel axis and of which the respective ends HA and [3A may overliangingly extend outwardly beyond the stringer beams l1 and I3. Spanningly riding upon such guideways is a compensating carriage structure that may comprise a pair of upright housings l5 and I5 as rigidly interconnected by said pair of stringer beams I1 and 18 arranged to constitute a bodily shiftable cradle that freely rides upon the upholding rollers such as IQA and [93. The opposed abutment bars 21A and MB direct the travel of our self-contained carriage perpendicularly to the wire region suspended between our reels in a direction parallel to the reel axis.

One or more rotatable grinder head discs 29A, B, etc. of the centrally apertured kind disclosed in the Vernon R. Pallas Patent No. 2,033,392 dated March 10, 1936, may be alignedly mounted to bridge said stringer beams as shown. A similar result may be had by the use of a non-rotating grinder head unit more fully defined in the Illmer and Pallas Patent No. 2,284,904 dated June 2, 1942 suited to treat narrow ribbonstock.

The particular type of grinder head herein illustrated is further detailed in Figs. 9 and 10 of the Illmer Patent No. 2,492,221 dated December 29, 1949 which likewise discloses suitable tape feed means and controls therefor.

A series of our rotatable grinder heads may be equipped with a manually controlled auxiliary drive motor 23 yoked to said stringer beams and provided with a head drive shaft 24. Such shafts may be gear connected at 25 to rotate several grinder heads in unison while our carriage is being reciprocated. A chain 22 from said head shaft may drive the differential gear casing 25 as interposed between the aligned sections 21A and 21B of a tape feed shaft. Each rotary grinder head is preferably provided with a planetary gear train such as 28 which may be operatively connected to the shaft section 2113.

Its mated shaft section 21A may be selectively rotated through a pair of change gears 29 as driven by an independently motorized and platform mounted speed reducer unit 30 whereby to alter the rate of tape advance fed to the work piece. All the foregoing separately motorized head accessories may be collectively shifted in unison with our grinder carriage travel. The top cross bar of each upright housing l5 and I6 may respectively have affixed thereto reversely directed prop straps that constitute the nut carriers 3 l and 32, as shown.

Spacedly erected outwardly beyond each such housing, is a pair of stationary frame masts 33 and 34 having their respective tips provided with parallel outrigger racks such as 35A and 35B. Spanning each pair of corresponding racks is a rotatably mounted fore or aft lead screw 3'! and 38 respectively mated to run with the parallel spindles 39 or 40 and collectively arranged as guided drag means for the nut carriers 3! and 32.

Parallelly located beneath each such lead screw at opposite ends of our grinder carriage, is a fore or aft reel axle 4| or 42 which respectively mount the straight faced transfer reels 43 and 44. These similar dual reels are preferably given a common diametral size commensurate with the treated wire dimension and a relatively long-sweep face approximately equal to such diameter to provide adequate one-piece storage capacity to meet high speed wire drawing needs. The opposed end regions of a reelable work piece 45 of finite length may respectively be closely laid and conjointly wrapped to reversely interspacedly lay a group of wire coils on each of our reel faces in a virtually combined single layer formation as shown to leave a rectilinear medial wire length or work piece component 15A tangentially suspended tightly between the reel rims that may be strung through several tandem head apertures.

As indicated in dotted outline, each outer end of such active continuous batch may have a supplemental-y coil length such as 46 appended thereto that is suitably affixed to a contiguous reel flange. Such disposition provides for a restricted time period in which to effect reel reversal and still abrasively treat the batch proper at a maintained relatively high travel velocity. Said carriers 3! and 32 may each be provided with a pair of depending guide pulleys 36 serving to juxtaposingly lay the wire upon a leading transfer reel.

Corresponding ends of each lead screw and its associated spindle may be interconnected by a set of change gears 43 to accommodate different wire sizes. The respective opposed ends of the spindles 39 or 4% may by gear train means, be made to run in unison with a contiguous reel axle through the mated small spur gears 49 and 59 and a cooperative stanchion mounted large spur gear 5!. The latter is shown chain driven at 52 by an axle sprocket 53A or 5313.

Said lead screws being applied to each carriage end, a common counterclockwise axle rotation will turn the respective lead screws in their indicated directions and thus cause our grinder head carriage to reciprocatively traverse the dual guid-eways MA and MB between certain dead center positions as actuated compensating means. By proper selection of the change gears 48, the rate of reciprocative carriage travel may be made to snugly wrap a wire batch in a virtually combined single layer formation that promotes a relatively rapid rate of work piece transference. Our tubular rotatable grinder heads are arranged to turn about the wire axis and cause abrasive tape to superficially treat the entire perimeter during each wire pass.

As regards the reversible drive for our reel axles i! and 42, this preferably comprises a pair of fore and aft bevel gear speed reducer units 5-. and 5-5 of which the respective slow speed outlet shafts such as 56 may be flange coupled at 41 to its mated reel axle. The respective high speed input shafts such 5'! of said units may be directed toward each other for clutch interconnection to the motorized split cross-shaft 58 as driven unidirectionally by the prime mover pulley 5E. The respective remote ends of the fore and aft axles may be upheld by a separate outboard bearing such as 60.

Each opposed end region of said cross-shaft may respectively be equipped with a remotely controlled fore or aft primary clutch 5! or 62. preferably of the pneumatic type, although an electromagnetic clutch may be likewise utilized. As detailed in Fig. 2A, each such air clutch may include a driven socketed drum element 63 having a conventional inflatable air gland c-r endless tube 56 aflixed thereto. When inflated, said tube contractably grips a perimetrically embraced follower drum element 65 mounted at one extremity, of said cross-shaft 58.

.The independently timed inflation and quick venting of each such air clutch gland may be placed in separate solenoid-actuated electrical fixtures of a conventional type (not shown) adapted to prevent the carrier nuts from trav eling outwardly beyond their intended respective dead center positions. In order to properly time such tube inflation in sequence, we may provide one of our nut carriers ill or 32 with an adjustable bevel-ended wiper cam 55 (see Fig. 3). The cooperating dual limit switches 67 and 68 of the snap type may be interspacedly sustained by mated outrigger racks 35A and 3513. Each such conventional multipole switch may be provided with a roller equipped rocker arm whose swinging end depresses the upstanding tip of a through trip tappet when said wiper cam overrides its arm roller.

The corresponding opposed depending tappet ends may be alternately shifted by a poised follower lever 69 (see Fig. 3) that restores such successively depressed tappets into an initially raised position. A certain dwell period then elapses during each next successive setting of our limit switch tappets. As will be understood, the electrical contact terminals of the respective switches may be conjointly wired. to said clutch fixtures. Accordingly, when the reels 43 and 44 rotate in unison, said fore and aft primary clutches 6i and 62 will be automatically reversed whenever the timed wiper cam 56 actuates one or the other of its cooperating switch tappets after the reeled wire batch becomes substantially transferred to the leading reel. If desired, our reels may also be provided with an emergency switch serving to shut down the primary motor in the event the appended coil length 46 should inadvertently become wholly unwrapped.

While the reels are being brought to a halt during the reverse running thereof, there is a tendency for a fast running trailing reel to overtravel and seriously slacken the suspended wire portion 55A because its grinder head entering length is not subjected to any pronounced abrasive drag. In order to remedy such occurrence and for other reasons, we positively interconnect the fore and aft reels through the sprockets H and 12 as afiixed to corresponding axle ends and their chain is or the equivalent thereof. As used herein, such layout does not require any special provision for slip compensation to slow down both reels in substantial unison. Said chain Z3 also holds the reels in exact phase so that our shiftable carriage will be evenly reciprocated in balanced relationship without cocking efiects. Each reel reversal automatically brings about a simultaneous reversal in carriage travel.

Referring now to 4, such grinder layout may be kept substantially identical to that previously described. In lieu of cross sbaft 53, an inbuilt substitute air clutch (similar to the pri-- mary air clutch is! or 62) may be incorporated in one or both reel axles to replace the flanged coupling d7. Such substitute air clutch may provide for a driven socketed drum element '55 aflixed to the slow speed outlet shaft of a bevel gear speed reducer such as 54' while the follower drum ll normally inserted into such socket, is afiixed to one end of the reel axle 73 as shown. The corresponding outboard bearing 39 be kept sufiiciently spaced from its contiguous reel flange to allow the axle section 18 to be unobstructedly withdrawn out of said follower drum 11 when said deflated substitute air clutch is rendered inoperative. Such combined clutch disposition may then serve as a demountable coupling that permits the reel axle 78 to be readily removed with a completely treated wire batch wound thereon, whereupon a newly loaded like replacement reel may be substituted with dispatch to replenish a treated wire batch and thereby attain a high output rate for our grinder machine. In such practice, the suspended batch portion 45A may for a time be severed as it first enters a grinder head.

Furthermore, the input shaft of the speed reducer 54 may be directly driven by a reversible motor 89 and if desired, another like motor may be axially coupled thereto by th armature connecting shaft 3! as indicated by dotted outline (see Fig. i). The control of the pass reversal of such motor or motors may be timed by dual limit switches 6'. and 88' of the kind disclosed in Fig. 1A. In such event, said switches may serve to trip the motor circuit breakers 33 for automatically bringing the reels to rest. A timed electromagnetic brake 82 mounted on the armature connecting shaft 3! be resorted to in expediting reel deceleration. 'The running of one or both of said direct connected motors to may thereupon be restarted manually to reverse the Work piece travel in successive reel passes until the desired degree or" superficial reduction has been attained. Our grinder is particularly suited to use coarse grit tape so as to effect 'apid stock removal at a linear abrasive velocity of several thousand feet per minute.

As will be apparent, instead of bodily reciprocating our combination grinder head carriage as described, a like compensative result may be obtained by working with non-shiftable head mountings and allowing the reels to equivalently shift axially in a direction perpendicular to the axis of a series of tandem grinder heads.

It is believed the foregoing rather explicit disclosure will make evident to those skilled in this art, the more outstanding advantages afforded by our strand grinder improvements, and we reserve the right to modify our illustrative design features without departing from the spirit and scope of our invention heretofore described and more particularly characterized in the appended claims.

We claim:

1. A reversible wire grinder machine comprising cooperating reels adapted to have a transferable strand portion tangentially suspended therebetween as a longitudinally dragged work piece of finite length, motive means applied to rotate the leading reel, a stationary framework interposed between said reels and including guideway means directed lengthwise of a reel axis and perpendicularly to the travel of the reel intercon necting strand portion, a grinder head carriage mounted to traverse said guideway means, the abrasive agency of such head being kept in operative engagement with the tangentially suspended portion of said work piece, means reciprocatively shifting said carriage in unison with the rotation of said leading reel whereby to maintain such suspended reel interconnecting portion in truly rectilinear alignment between its respec tiv ends, and means for automatically reversing the reels when the strand length remaining on the trailing reel closely approaches its work piece terminal.

2. A reversible wire grinder machine comprisin; cooperating reels adapted to have a transferable strand portion tangentially suspended therebetween as a longitudinally dragged work piece,

motive means applied to rotate the leading reel, a stationary framework interposedbetween said reels and including guideway means directed perpendicularly to the travel of the reel interconnecting strand portion, a grinder head carriage mounted to traverse said guideway means with the abrasive agency of such head kept in opera tive engagement with the work piece, and lead screw means rotatably mounted upon said framework and geared to reciprocatively shift said carriage in unison with the rotation of one such reel whereby to hold such tangentially suspended strand portion in rectilinear alignment between the respective ends thereof and in a definitely retained perpendicular relation to one reel axis.

3. A reversible wire grinder machine comprising cooperating reels adapted to have a transferable strand portion tangentially suspended therebetween as a longitudinally dragged work piece portion, motive means applied to rotate the leading reel, stationary framemast means disposed adjacent to each such reel respectively including an outrigger rack, bed plate means provided with an upturned guideway transversely interposed between said mast means, a carriage mounted to ride upon said guideway, a series of grinder heads conveyed by said carriage with their abrasive agencies respectively brought into operative engagement with the suspended strand portion, a nut carrier affixed to each opposed end region of said carriage, a separate lead screw rotatably supported by said racks and arranged to cooperate with a contiguous carrier nut, and means rotating said screws in unison with one of said reels whereby to maintain such tangentially suspended portion in truly rectilinear alignment between the respective ends thereof and in a definitely retained perpendicular relation to one reel axis.

4. A reversible wire grinder machine comprising parallelly mounted reels having opposed sets of mated corresponding ends and adapted to have the respective terminal regions of a reelable strand conjointly wrapped about said reels in a virtually combined single layer formation to leave a medial strand region tangentially suspended between said reels as a transferably dragged work piece, means arranged to laterally shift the suspended strand region alternately into substantial alignment with each set of corresponding reel ends, motive means applied to rotate the leading reel, grinder head means having its abrasive agency maintained in operative engagement with said suspended strand region, timed carriage means shiftably mounting said grinder head and said leading reel in concatenate relationship to compensate for lateral work piece shift and definitely maintain the suspended strand region throughout its length in a definite rectangular relation with respect to both reel axes, and means for periodically reversing reel rotation.

,5. A reversible wire grinder machine comprising parallelly mounted reel axles having mated corresponding ends and which reels are adapted to have the respective terminal regions of a reelable strand of finite length conjointly wrapped about the respective reels in a virtually single layer formation to leave a medial strand region tangentially suspended therebetween as a transfer-ably dragged work piece that is simul-- taneously shifted laterally toward said corre sponding axle ends, timed reciprocative carriage means arranged to ride along associated guideway means directed lengthwise in substantial parallelism with the axis of one reel and crosswise of said dragged work piece region, grinder head means conveyed by said carriage and the abrasive agency of which head is kept in operative engagement with such suspended strand region of which its entire length is kept in rectilinear alignment and truly perpendicular with respect to said one reel axle, motive means applied to rotate the leading axle, and a positive drive connection interposed between said axles serving to maintain the trailing axle in exact phase with its leading axle.

6. A wire grinder machine comprising parallelly mounted reel axles having mated corresponding ends and which reels are adapted to have the respective terminal regions of a reelable strand of finite length conjointly wrapped about the reel perimeters to leave a medial strand region tangentially suspended therebetween as a transierably dragged work piece, means for simultaneously shifting the suspended work piece region laterally toward corresponding axle ends while the work piece is being transferred, motive means applied to rotate the leading reel, reciprocative carriage means arranged to ride along associated guideway means directed in substantial parallelism with the axis of one reel and rosswise of said suspended strand region, rotatable grinder head means conveyed by said carriage, and an independently motorized head drive shaft also carried by said carriage and serving to rotate said head means.

7. A wire grinder machine comprising parallelly mounted reels having mated corresponding ends and adapted to have the respective terminal regions of a reelable strand of finite length conjointly wrapped about the respective reels to leave a medial strand region tangentially suspended therebetween as a transferably dragged work piece, means for laterally shifting said medial strand region toward corresponding reel ends and which medial strand region throughout its length is kept in rectilinear suspension without lateral deviation from a straightlined transfer course, motive means applied to rotate the leading reel, reciprocative carriage means arranged to ride along associated guideway means directed axially lengthwise of one reel and crosswise of said dragged work piece region, grinder head means equipped with abrasive tape maintained in operative engagement with said medial strand region and conveyed by said carriage, and a motorized tape feed mechanism also carried by said carriage and serving to advance abrasive tape toward said work piece.

8. A reversible wire grinder machine comprising parallelly mounted reel axles having mated corresponding ends and which reels are adapted to have the respective terminal regions of a reelable strand of finite length oonjointly wrapped about the respective reels to leave a medial strand region tangentially suspended therebetween as a transferably dragged work piece that is also shifted laterally toward corresponding axle ends, said reels being of the long-sweep type respectively having a face width substantially equal to the diameter of one such reel, reciprocative carriage means arranged to 'ide along associated guideway means directed axially lengthwise of one reel and crosswise of said suspended strand region, the last named region being retained in a definite rectilinear relation to the axis of said one reel, grinder head m ans borne by said carriage and the abrasive agency of which head means is kept in operative engagement with such suspended strand region, opposed nut carriers arranged to reciprocatively actuate said carriage, a lead screw cooperating with each such nut and which screws are respectively disposed alongside one of said reels, and an axle connected gear train serving to rotate the dual lead screws in unison and thereby automatically reverse carriage travel simultaneously with the reversal of the reel axles.

9. A reversible wire grinder machine comprising parallelly mounted reel axles having mated corresponding ends and which reels are adapted to have the respective terminal regions of a reelable strand of finite length conjointly wrapped about the respective reels to leave a medial strand region tangentially suspended therebetween as a transferably dragged work piece that is trained to shift laterally toward mated corresponding axle ends, reciprocative carriage means driven from a reel axle and arranged to ride along associated guideway means extending axially lengthwise of one reel and crosswise of said dragged work piece region, grinder head means conveyed by said carriage and the abrasive agency of which head means is kept in operative engagement with such suspended strand region, and a pneumatic clutch for one of the reel axles and which clutch comprises a socketed driven element together with a follower element having an inflatable gland interposed therebetween, a portion of said one axle being separable and freely withdrawable axially from its socketed clutch element when the gland thereof is noninflated.

10. A wire grinder machine comprising parallelly mounted reel axles having mated corresponding ends and which reels are adapted to have the respective terminal regions of a reelable strand conjointly wrapped about the respective reels in a virtually single layer formation to leave a medial strand region tangentially suspended therebetween as a transferably dragged work piece that is trained to shift laterally toward corresponding reel ends in a definite rectangular relation to one such axle, grinder head means whose abrasive agency is kept in operative engagement with such suspended strand region, a speed reducer aflixed to drive a leading reel axle,

complementary timed switch means successively actuated when the dragged work piece closely approaches one or the other of said corresponding reel ends, and electrical motive means applied to drive the leading reel axle and wired to include a motor circuit breaker, said switch means when actuated serving to automatically interrupt power application by said motive means.

11. A wire grinder machine comprising parallelly mounted reel axles having mated corresponding ends and which reels are adapted to have the respective terminal regions of a reelable strand conjointly wrapped about the respective reels in a virtually single layer formation to leave a medial strand region tangentially suspended therebetween as a transferably dragged work piece that is trained to shift laterally toward corresponding reel ends in a definite nondeviating rectangular relation to one such axle, grinder head means whose abrasive agency is kept in operative engagement with such suspended laterally shiftable strand region, a separate reversible electrical motor driving each reel axle and having the motor armatures coupled together, a timed electromagnetic brake rotatably driven in unison with such armature coupling, and switch means serving to time said brake when the dragged work piece closely approaches one of the corresponding reel ends.

12. A wire grinder machine comprising a pair of parallelly mounted reels affording opposed sets of mated corresponding ends adapted to have the respective terminal regions of a reelable strand of finite length conjointly Wrapped about said reels in a virtually combined single layer coil formation to leave a medial rectilinear strand portion tangentially suspended between said reels as a transferably dragged work piece portion that is maintained in a definite perpendicular relation with respect to the reel axes, grinder head means arranged to have its abrasive agency maintained in operative engagement with the entire perimeter of said suspended work piece portion in a single unidirectional pass thereof, motive means applied to rotate the leading reel, guideway means extending parallelly to the axis of one such reel, and an actuated grinder head carriage mounted to reciprocatively traverse said guideway means in timed relation to the rotation of the leading reel and which suspended rectilinear work piece portion is laterally shifted bodily in unison with said carriage into substantial alternate alignment with each set of such mated corresponding reel ends while the suspended medial strand portion is being transferred onto the leading reel.

13. A wire grinder reeling system comprising a leading reel rim and a cooperating trailing reel rim having substantially parallel axles which simultaneously wrap the respective terminal regions of a finite wire batch conjointly onto the leading rim and off of the trailing rim to provide for a pair of wire interconnected coil groups respectively wrapped lengthwise of their rims into a virtually combined single layer coil formation to leave a transferable rectilinear medial batch region tangentially suspended between said rims in interposed relation with such coil groups to constitute a truly rectilinear medial work piece component that when further wrapped is bodily shifted laterally toward one end of the leading rim, motorized tubular grinder head means equipped with an abrasive agency operatively maintained in engagement with such work piece component and which component is threaded through said head means, and automatically timed carriage means positively driven from a reel axle to synchronously compensate for the aforesaid bodily shift of the work piece component by correspondingly conveying the grinder head means in unison therewith.

LOUIS ILLMER. VERNON R. PALLAS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,401,961 Coryell Jan. 3, 1922 1,539,795 Hutchins May 26, 1925 1,866,212 Huxford et al July 5, 1932 2,033,392 Pallas Mar. 10, 1936 2,396,852 Illmer Mar. 19, 1946 FOREIGN PATENTS Number Country Date 2,932 Great Britain Dec. 24, 1891 

